Here is the caster flange bearing for many Invacare wheelchairs. The bearing allows the caster fork to pivot as needed. This bearing measures 1-1/4" in width with a 1/2" hole diameter.
Please refer to the Compatibility list to see if your Invacare wheelchair model uses this caster flange bearing.
Need to order two more bearings when I first order I did not order for the other side but I'm thrilled with the order I got love it and it was easy to install and we didn't use the sware jar after all ,